COCONUT LAYER CAKE

Steps:

• Heat the oven to 350 degrees. Arrange two racks in the center of the oven. Line the bottom of three 6-by-2-inch buttered round cake pans with parchment paper. Dust the bottom and the sides of the cake pans with flour, and tap out any excess. Sift together flour, baking powder, baking soda, and salt, and set the bowl aside.
• In the bowl of an electric mixer fitted with the paddle attachment, cream butter on medium-low speed until fluffy, 1 to 2 minutes. Gradually add sugar, and keep beating until the mixture is fluffy and light in color, about 3 minutes. Gradually drizzle in egg yolks, beating on medium-low speed between each addition until the batter is no longer slick. Beat until the mixture is fluffy again, about another 3 minutes.
• Alternate adding flour mixture and sour cream to the batter, a little of each at a time, starting and ending with the flour mixture. Beat in vanilla. Divide the batter between the prepared cake pans. Bake until a cake tester inserted into the center of each cake comes out clean, 30 to 40 minutes, rotating the pans in the oven, if needed, for even browning. Transfer cake pans to wire racks to cool, about 15 minutes. Remove cakes from pans, and let cool completely on racks, tops up.
• To assemble, remove parchment paper from the bottoms of cakes. Split each layer in half horizontally with a serrated knife. Set aside the prettiest dome; it will be used for the final layer. Place another domed layer, dome side down, on the serving platter. Sprinkle 2 to 3 tablespoons of flaked coconut over the cake. Spread a generous 1/2 cup coconut-cream filling over coconut flakes. Repeat sprinkling and spreading process on the remaining layers until all but the reserved domed layer are used. Top cake with the reserved domed layer. Transfer cake to the refrigerator to firm for 1 hour. Remove from the refrigerator, and frost the outside of cake with seven-minute frosting. Sprinkle remaining coconut flakes all over cake while frosting is soft; do not refrigerate. Cake can be left out at room temperature for several days.